GSM2 datasheet - Greenwich Instruments Ltd
Contents
1. INSTRUMENTS LTO UK Greenwich Instruments Ltd GSM 2 Meridian House Park Road Swanley Kent BR8 8AH T AR an STEPPER MOTOR DRIVER CARD Fax 0843 289 4783 www greenwichinst co uk Issue 4 4 DEC 2005 Description The GSM2 driver card is designed to drive a stepper motor in unipolar mode either with or without forcing resistors connected between motor commons and volts Full half or wave mode are selected as is direction and speed external clock via the logic connections Speed can also be derived from an adjustable on board clock An enable and disable input allow for a variety of start stop control options to be implemented The stepper motor must have four phases and either five six or eight wires The GSM2 card has two terminal blocks and a trimmer pot The first block is for connection of the motor and power supplies the second block being for logic connection The trimmer pot adjusts the speed of the on board clock The logic inputs outputs are generally TTL LS and CMOS 12 Volt max com patible and are fitted with various series and pull up or down resistors See tables below The phase outputs are open drain power MOSFET source to OVM with a fast diode between drain and VM e ON BOARD Connector Block One OVM Motor OV Connected internally to OVL VM Motor Volts 9 40 VDC smoothed PHA Motor winding Phase A up to 2 Amp PHB Motor winding Phase B PHC Motor wind2. ard 180 R resistor in series Can be used for tying inputs high Notes Can be the same power supply motor volts then 9 24Vdc max 470 uF capacitor on board is OK smoothing for low current motors Max motor discharge voltage 55 Volts peak s Signal voltages are referenced to OVL lt 1 5V LOW gt 3 5V HIGH Max input 12VDC and Min input 0 6V ENB is pulled high All others input are pulled low if left unconnected Input impedance approx 10K CKI Operates on rising edge uts CKO 0 5 Volt square wave via 1K series resistor 5V 5 Volts via 180R resistor PHA PHD Phase Orientation Direction etc May vary for different motors Power 20mA Logic VL Plus 5V Out Up to 4 Amp motor VM two windings driven 2 amp per winding ii 2 ore on oF OFF 3 or ON ON ore 4 ofr ore ON OFF 5 OFF OFF ON ON e orr o oF ON Le on T o oF OFF HALF STEP SEQUENCE N wo BN oa STEP SEQUENCE IS REVERSED FULL STEP SEQUENCE 4 ON OFF OFF ON WAVE STEP SEQUENCE CKI ENABLE amp DISABLE CKI ENB __ DIS Motor use and connection 1 ON OFF OFF OFF 3 orr on oF OFF For low speed applications the motor can be simply connected 4 ON OFF OFF ON between the phase and VM terminals of the GSM2 and then the STEP SEQUENCE IS REVERSED WHEN DIR IS CHANGED correct
3. ents instructions in the user manual or b the installation or use of the product in a manner inconsistent with the technical or safety standards in force at the time 6 Forcing Resistor for use with unipolar drive and stepping motor Circuit V Power supply Forcing DC Smoothed Resistor RF IM Motor Winding VM y 1 Value of Forcing Resistor RF From Ohms Law RF V IM RM Ohms RM motor winding resistance see below 2 Power rating of Forcing Resistor W IM x V VM Watts 3 VM motor voltage rating see plate on motor IM motor current rating see plate on motor Therefore RM VM IM Example IM 200mA motor plate 0 2 Amp VM 12 motor plate Therefore RM 12 0 2 60R V power supply 24 Volts for instance Therefore RF 24 0 2 60 60R Power of RF 0 2 x 24 12 2 4 Watts Therefore use 2 5 Watt will get very hot or better 4 Watt resistor at 68R next preferred value higher 5 CKI CKO DIS WAV DIR H F ENB 5V k Input Outp Connector Block Two Step Rate Input 0 2000 Hz or half steps if selected Output 20 600 Hz approx adjusted by on board trim pot Input CKI enabled when low Input Motor stepped in wave mode when high Input Motor direction clockwise when low Input Half or full step select Full step when low Also WAV Low Input CK Enabled when high Output 5V at up to 20mA with on bo
4. ing Phase C PHD Motor winding Phase D VL Logic Control Volts 9 24VDC OVL Logic OV Connected internally to OVM 1 Temperature Range 5 35 deg C gt 1 amp per winding 5 65 deg C lt 1 amp per winding Dimensions 61mm x 46mm x 15mm high Warnings Turn OFF power supply before connecting or disconnecting any wiring circuitry motor etc to the GSM2 board DISCONNECTING THE MOTOR WITH THE POWER ON WILL DESTROY THE GSM2 The GSM2 will get hot with higher current motor connected Motor windings can generate very high discharge voltages Warranty By this Consumer Guarantee Greenwich Instruments Limited guarantees this product to be free of defects in materials and workmanship at the time of its original purchase from the Retailer for the period of one year If during this period of guarantee the product proves defective due to improper materials or workmanship Greenwich Instruments will without charge for labour or parts repair or at its option replace this product or its defective parts on the conditions set out below 1 The customer will not alter adapt change or in any way adjust the product except as detailed in this manual 2 This guarantee does not cover i Maintenance or replacement of parts due to fair wear and tear ii Home service or transport costs to the Dealer iii Damage to this product resulting from a abuse or misuse by the customer including failure to follow Greenwich Instrum
5. motor voltage check on the motor rating plate or motor STEP SEQUENCE SELECT manufactures data can be connected to the VM and OVM terminals DIR WAVE HIF Motors with a rated winding current of up to 2Amps can be used in OR UNCONNECTED this way It should be noted that a stepper motor running at maximum H HIGH LOGIC x C JP L LOW LOGIC rated current may become very hot and need to be cooled Please X DON T CARE note that different motor manufactures specify motors in various different ways For the best performance the motor power supply TEN F should be as smooth low ripple as possible A large electrolytic Typical connection including possible capacitor with a low ESR is recommended Photo Switch and Forcing Resistor a N For higher speed applications forcing resistors and winding discharge L RESISTOR components can be added The forcing resistor allows a higher motor Block 2 MOTOR voltage to be used This voltage appears mostly across the motor at TOM QU ROV toes TON WINDINGS the start of each step over coming the motor s inductance and EXTERNAL CLOCK forcing current into the winding The discharge component restricts ON BOARD CLOCK en i PHD the winding current at the end of the step A number of points need to eke LIK Fa 9VM be considered Firstly the increased size of motor power supply OR ON BOARD 5V LINKED VL VL required Secondly the size and power rating of the forcing resistor DIS gt on BOARD L
6. ovL OVL and discharge components It may be worth using a larger motor running at less than full power and the lower winding inductance will MOTOR SUPPLY MAY help with step speed This is not a waste as in most applications to REQUIRE ADDITIONAL b j SMOOTHING CAPACITORS obtain the required running torque the holding torque will be very ONLY 470U ON BOARD i large Plus the de rated motor will not become so hot When using LOGIC SUPPLY FULL WAVE X j RECTIFIED 50 60 HZ IS OK winding discharge components placed between the motor power supply V and VM on the GSM2 at no time must the voltage at VM or PHA D exceed 55V peak referenced to OVM For further information see motor and distributor application notes Also Greenwich Instruments have a number of worked examples WAVE gt GSM2 SELECT DIRECTION AND STEP SEQUENCE DIR gt 5V H F 10K TYP ENB logic FLAG LOW STOP NOTE SWITCHES SHOWN ABOVE BUT LINKS OR LOGIC LEVEL SIGNALS CAN BE USED PHOTO SWITCH ON MOTOR SHAFT LOGIC RETURN 3 4l
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